PMID- 30893423 OWN - NLM STAT- MEDLINE DCOM- 20200403 LR - 20200403 IS - 1460-2377 (Electronic) IS - 0953-8178 (Linking) VI - 31 IP - 6 DP - 2019 May 21 TI - Tissue regulatory T cells and neural repair. PG - 361-369 LID - 10.1093/intimm/dxz031 [doi] AB - Inflammation and immune responses after tissue injury play pivotal roles in the pathology, resolution of inflammation, tissue recovery, fibrosis and remodeling. Regulatory T cells (Tregs) are the cells responsible for suppressing immune responses and can be activated in secondary lymphatic tissues, where they subsequently regulate effector T cell and dendritic cell activation. Recently, Tregs that reside in non-lymphoid tissues, called tissue Tregs, have been shown to exhibit tissue-specific functions that contribute to the maintenance of tissue homeostasis and repair. Unlike other tissue Tregs, the role of Tregs in the brain has not been well elucidated because the number of brain Tregs is very small under normal conditions. However, we found that Tregs accumulate in the brain at the chronic phase of ischemic brain injury and control astrogliosis through secretion of a cytokine, amphiregulin (Areg). Brain Tregs resemble other tissue Tregs in many ways but, unlike the other tissue Tregs, brain Tregs express neural-cell-specific genes such as the serotonin receptor (Htr7) and respond to serotonin. Administering serotonin or selective serotonin reuptake inhibitors (SSRIs) in an experimental mouse model of stroke increases the number of brain Tregs and ameliorates neurological symptoms. Knowledge of brain Tregs will contribute to the understanding of various types of neuroinflammation. CI - (c) The Japanese Society for Immunology. 2019. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com. FAU - Ito, Minako AU - Ito M AD - Department of Microbiology and Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan. FAU - Komai, Kyoko AU - Komai K AD - Department of Microbiology and Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan. FAU - Nakamura, Toshihiro AU - Nakamura T AD - Department of Microbiology and Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan. FAU - Srirat, Tanakorn AU - Srirat T AD - Department of Microbiology and Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan. FAU - Yoshimura, Akihiko AU - Yoshimura A AD - Department of Microbiology and Immunology, Keio University School of Medicine, Shinjuku-ku, Tokyo, Japan. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review PL - England TA - Int Immunol JT - International immunology JID - 8916182 RN - 0 (Cytokines) RN - 0 (Receptors, Serotonin) RN - 0 (serotonin 7 receptor) SB - IM MH - Animals MH - Astrocytes/*immunology MH - Brain/*immunology MH - Cytokines/metabolism MH - Disease Models, Animal MH - Humans MH - Inflammation/*immunology MH - Mice MH - Receptors, Serotonin/metabolism MH - Reperfusion Injury/*immunology MH - T-Lymphocytes, Regulatory/*immunology MH - Wound Healing OTO - NOTNLM OT - amphiregulin OT - astrogliosis OT - serotonin OT - stroke OT - tissue repair EDAT- 2019/03/21 06:00 MHDA- 2020/04/04 06:00 CRDT- 2019/03/21 06:00 PHST- 2019/01/20 00:00 [received] PHST- 2019/03/19 00:00 [accepted] PHST- 2019/03/21 06:00 [pubmed] PHST- 2020/04/04 06:00 [medline] PHST- 2019/03/21 06:00 [entrez] AID - 5410252 [pii] AID - 10.1093/intimm/dxz031 [doi] PST - ppublish SO - Int Immunol. 2019 May 21;31(6):361-369. doi: 10.1093/intimm/dxz031.